an oil well that has come in with such great pressure that the oil jets out of the well like a geyser. In reality, a gusher is a blowout and is extremely wasteful of reservoir fluids and drive energy. In the early days of the oil industry, gushers were common, and many times were the only indications that a large reservoir of oil and gas had been struck.A well that comes in with such great pressure that the oil blows out of the wellhead and up into the derrick, like a geyser. With improved drilling technology, especially the use of drilling mud to control downhole pressures, gushers are rare today. See Blowout.
